设计模式之抽象工厂模式

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Reflection;
using System.Configuration;

namespace 设计模式之抽象工厂模式2
{
    class Deparentment{

    }
    interface IDepartment
    {
        void Insert(Deparentment department);
        Deparentment GetDepartment();
    }
    class SqlserverDepartment : IDepartment
    {
       public void Insert(Deparentment deparent)
        {
            Console.WriteLine("在SQL中为deparent表增加了一条记录");
        }
       public Deparentment GetDepartment()
        {
            Console.WriteLine("从SQL中的deparent表中取出了一条记录");
            return new Deparentment();
        }
    }
    class AccessDeparent:IDepartment
    {
       public void Insert(Deparentment deparent)
        {
            Console.WriteLine("在Access中为deparent表增加了一条记录");
        }
      public  Deparentment GetDepartment()
        {
            Console.WriteLine("从Access中的deparent表中取出了一条记录");
            return new Deparentment();
        }
    }
    class User
    {

    }
    interface IUser
    {
        void Insert(User u);
        User GetUser();
    }
    class SqlUser:IUser
    {
        public void Insert(User u)
        {
            Console.WriteLine("在Sql中向User表中添加了一条记录");
        }
        public User GetUser()
        {
            Console.WriteLine("从SQL中的User表中取出了一条记录");
            return new User();
        }
    }
    class AccessUser:IUser
    {
        public void Insert(User u)
        {
            Console.WriteLine("在Accesss中向User表中添加了一条记录");
        }
        public User GetUser()
        {
            Console.WriteLine("从Access中的User表中取出了一条记录");
            return new User();
        }
    }
    class DataAccess
    {
        private static readonly string AssemblyName = "设计模式之抽象工厂模式2";
        private static readonly string db = ConfigurationManager.AppSettings["DB"];
        public static IUser CreateUser()
        {
            string className = AssemblyName + "." + db + "User";
            return (IUser)Assembly.Load(AssemblyName).CreateInstance(className);
        }
        public static IDepartment CreateDeparent()
        {
            string className = AssemblyName + "." + db + "Department";
            return (IDepartment)Assembly.Load(AssemblyName).CreateInstance(className);
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            User user = new User();
            Deparentment dept = new Deparentment();
            IUser iu = DataAccess.CreateUser();
            iu.Insert(user);
            iu.GetUser();
            Console.Read();
        }
    }
}

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <startup> 
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
    </startup>
  <appSettings>
    <add key="DB" value="Access"/>
  </appSettings>
</configuration>